1,2-Dithiin Annelated with Bicyclo[2.2.2]octene Frameworks. One-Electron and Two-Electron Oxidations and Formation of a Novel 2,3,5,6-Tetrathiabicyclo[2.2.2]oct-7-ene Radical Cation with Remarkable Stability Owing to a Strong Transannular Interaction
作者:Atsushi Wakamiya、Tohru Nishinaga、Koichi Komatsu
DOI:10.1021/ja028297j
日期:2002.12.1
SbCl(5) in CH(2)Cl(2), a radical cation 4.+ was formed, whose spin distribution was determined by ESR spectroscopy and by the results of theoretical calculations (UB3LYP/6-31G). The electronic absorption spectrum of 4.+ in CH(2)Cl(2) exhibited a maximum absorption at 428 nm (epsilon = 2.3 x 10(3)), which was hypsochromically shifted from that of neutral 4 (469 nm). When the radical cation 4.+ was produced
通过双环 [2.2.2] 辛烯的二锂化二聚体与元素硫以 59% 的产率反应,合成了与双环 [2.2.2] 辛烯骨架 4 退火的 1,2-二硫辛的稳定衍生物,为红色晶体。在-78 摄氏度的 CH(2)Cl(2) 中 4 的循环伏安法在 E(1/2) +0.18 V 和 +0.72 V 与 Fc/Fc(+) 显示两个可逆氧化波,表明自由基在这些条件下,4 的阳离子和双阳离子是稳定的。在以相当低的浓度 (4.0 x 10(-4) M) 对 4 进行化学单电子氧化后,在 CH(2)Cl(2) 中使用 1.5 当量的 SbCl(5),形成自由基阳离子 4.+ ,其自旋分布由 ESR 光谱和理论计算结果 (UB3LYP/6-31G) 确定。CH(2)Cl(2) 中 4.+ 的电子吸收光谱在 428 nm (epsilon = 2.3 x 10(3)) 处表现出最大吸收,这是从中性 4 (469 nm)